Blackboard-eraser.



R. A. COSTELLO.

BLACKBOARD ERASER.

APPLICATION HLED 05c. 26. 1914.

Patented Oct. 19, 1915.

RICHARD A. CQSTELLG, OF'CHICAGO HEIGHTS, ILLINOIS.

IBLAGKBOARD-ERASER.

Specification of Letters Extent.

Patented Oct. 19, 1915.

Application filed December 26. 1914. Serial No. 879,036..

To all whom it may concern:

Be it known that T, RICHARD A. Cos'rnLLo, a citizen of the United States, residing at the city of Chicago Heights, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Blackboard-Erasers, of whichthe' following is a specification. 7

My invention relates to .the erasers which are used for removing chalk marks from blackboards. Such erasers are best formed of strips of'rubbing material so secured to an elastic or flexible back that a multiplicity of free ends are presented to form the rubbing faces. While this has been done in many ways, my invention affords means of constructing an eraser which is light, resilient and noiseless. My invention also-. p r0- to each other.

forming two rubbing'strips should be apv plied to the back piece 1, so that the cut and rides means by which the parts may be firmly and securely fastened together, and the construction is particularly adapted to cheap and rapid manufacture.

The principles of my invention are, illustrated in the drawings, in which Figure 1 shows a'perspective View of a complete eraser; Fig. 2 is a cross section thereof on the line 22 and shows a preferred form of construction; Fig. v3 is a similar section showing an alternative form of construction; Fig. i is a cross section of one of the rubbing members.

Further describing my invention with reference to the drawings: 1 is a back piece, preferably of felt or similar material, which forms the foundation to which the rubbing members are attached. The said rubbing members should'be twice the width of the rubbing strips which are projected downwardly from the underside of the back or foundation piece. pieces of suitable material, preferably felt, which should be longitudinally scored to form the cut faces 3 so that the two sections 4:, forming the rubbing-strips, be turned backward upon the uncut portion 5, whereby the sides 6 of the strips will be adjacent The said members each now squared faces 3 will be in contact with the underside of said back piecel When so placed rows of stitching 7 should be passed from a point 8 on the sides of the rubbing Copies of this patent may be obtained for Said members consist of i strips, considerably removed from the back piece diagonally through the rubbing memher and the back piece. As the rubbing strips are somewhat inclined while the rows of stitching are being run, when placed in their proper position, practically at right angles to the eraser back, the rows of stitching will be somewhat curved, as shown in the drawings.

The description as applied to Fig. 2 may also apply to the alternative form shown in Fig. 3, 7 representing the rows of stitching by which the rubbing members are secured to the back, and 8 representing the points on the sides of the several rubbing strips at which the securing rows of stitching are applied. As a finish for the construction described, a back piece 9 may be added and secured in place by a row of stitching 10.

It is found in practice that the method of consmuction shown, whereby two rubbing strips integrally formed are applied to the back, provides a very desirable means by which the erasers maybe made. The amount of stitching is much reduced, and while there are acomparatively small number of pieces to handle, the parts are more readily held in proper relation while the operation of stitching them together is carried on.

Having thus fully described my invention what I claim as new and desire to secure by Letters Patent is In a blackboard eraser; the combination with .a back piece of a plurality of rubbing members, said rubbing members being scored'and turned backwardly at the score to form two attached rubbing strips with continuous squared edges across the cut por-- tion, which said edges are applied to the under side of the said back piece, and rows 'ofstitching engaging, the outer faces of said rubbing strips and passed upwardly and RICHARD A. COSTELLO.

Witnesses:

FRAN 1; Posvro, ETHEL TOMASEK.

five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

